A Science Teacher’s Companion to the BBC Microcomputer by P. Hawthorne

By P. Hawthorne

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GET ret~rns the ASCII value of the key pressed and since ASC("l") 49 then GET-48 returns the value 1 if the '1' key is pressed, 2 when the '2' key is pressed and so on. PROCquestion is fairly self-e~planatory. ) This process continues until the correct answer is given (REPEAT ... UNTIL right see lines 3210-3260). Modifications You will probably want to add data for extra samples. This can be done by following the DATA format given above but note that at present all samples consist of isotopes of one element only.

With the cursors linked in this way the characters can be printed anywhere on the screen (wherever the graphics cursor is positioned), not just in the normal lines and columns of the selected mode. PROC/FN List 370 PROCplot_bomb plots a dot at the current bomb coordinates. 450 PROChit, as previous program. 540 PROCpause. Program Description 20-100 Initialising section. 60- 70 Creates strings from user characters defined previously. 110-360 Main loop. 170 Resets target colour ( PROChit leaves it set to background).

Some of the less obvious points are In line 460 the 'CHR$226' prints a mathematical 'therefore' symbol. Line 530 sets a graphics window in the velocity selector region. Hence the ion tracks can be erased using 'CLG' without clearing the entire diagram. The 'CHR$227' in lines 690,710 is a superscript '2', used to represent 'squared' . PROCtest. The main part is a REPEAT... UNTIL loop which ends when the space bar is pressed (A = 9). Within this loop, a FOR.. NEXT loop calculates the radius, draws the track and updates the meter reading for each isotope.

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